Steam-boiler furnace.



W. A. GILCHRIST.

STEAM BOILER FURNACE.

APPLicATioN min APH. 17, |911.

Patented Jan. 4, 12H6.

3 SHEETS--SHEET I.

Wl' Maa/H oooooo W. A. GiLC-HHST.

SEM BQLEH NACE.

WPLICAUQN man wu. ur, 19H.

1,166,679. Patented Jan. 4, 1916;

3 SHEETS-SHEET 2.

WA A. GILCHRIST.

STEAM BUILEH FURNACE.

MPLICATloN msn 111111.11. 191.1.

Patented Jan. 4, 1916.

3 SHEETS-SHEU 3.

".vnof/l WILLIAM A. GILCHBIST, OF MENTE-IS, TENNESSEE.

STEAM-BOILEB FUBNACE.

Application 1ed April 17, 1911.

To all Ywlwm, it may conc-em:

Be it known that L WILLIAM A. GIL- Cmns'r, a citizen of the United States, and resident of Memphis, county of Shelby, and

5 State of Tenneee, have invented certain new and useful Improvements in Steam- Boiler Furnaces, of which the following .is a specication, 'and which is illustrated in the accompanying drawings, forming a part thereof. i

The invention relates to steamboiler furnaces, and has for its primary object-to provide improved means for `gener-:itung steam throz'igh'theuseofsnclinelsaslufgasseand thefoifal .produced in the; of lumber. As these fuels contain a large proportion of volatile combustible products and the vaporization of whichf'absorbs 'agreat deal of heat, has'heretofore beennenced in maintaining the irez'itf'a tly high temperature. for

omlu'stion -to' proceed rapidly, while suicient inclosed space and air supply-for that the combustion of the volatile products will be complete. Q

The present invention this dilli- 'c` -randcontem' p f T-gthe and a combustion chamber 'of large ''cacity having' direct' communication A high fm a m" US 'am the the-box, forthe-ffire threin nosdi rectlyexposed" totherelativ ycoowa o the boiler shell the gases produced in have access to the large 1;: Q11 their 'pesage is suieiently slow to admit of comns y Y In thefaom 0' drawings, Figi' 1re 1 is a;'long1` t-udm' al "eti. view of asteam u l embodV i ying the ftllres4 of In'vovelnenn t provided by the invention, the plane' off-he f fbemg' -indiiedby the 1-1 'on Fig. 2, and the boiler being shown Vin sideelevvaion; Fig. a tran sversev vertical sedionalview on the line2-2 of Fig. 1:; and Fig. 3 isa perspective 'of that of the 'nrnaceland boiler in rear of fi:re-box, some of the partsbcingbroken away.

The construction illustrated comprises a pair of horizontal cylindrical return flue Specificaon of Letrs Patent.

intesa tire-box separated Patented Jan. 4, 1916.

serial No. 621,726.

steam boilers 10, 11. These boilers are of ordinary construction, and each is equipped with the usual return flue tubes 14 extending through the boiler shell from end to end. In carrying out the invention the boilers 10, 11, are mounted in a Unitary masonry setting. This setting comprises side walls 2l and 22, and a rear end wall 23. As shown, the boilers 10, 11, are located side by side at the same elevation, and both are hung by front. and rear stays, as 15, 15, and 16, 16, from beams 17 and 18, which extend transversely over the boiler settingv 12 and are each supported adjacent their ends upon columns 19, 20, located beyond the side wall-S21, 22, respectively, at each side of the boiler setting.

The side Walls 21, 22, of the boiler setting are cach turned inwardly at their higher ends, as indicated at 24, 25, to meet the adjacent sides of the boilers 10 and 11, respectively. preferably above' the level of the return ues 14. Similarly, the rear end wall 23 of the boiler setting 12 is turned inwardly adjacent its higher end, as indicated at 26 (Fig. 1) to meet the rear end walls of the boiler shells In this way a common ue space 2T is provided which extends beneath the boilers and e-long'their under Side portions, and communicates with the return lues 14 of the boilers at their rear ends. To provide a cover for the Hue space 27 between the boilers 10. 11, an arched roof 28 is employed.

Preferably the floor 29 of the flue space 2T is vertically offset intermediate its ends, as indicated at 33, its iront end portion 30 being at the lower level. A combustion Space 31 of large capacity and of considerable vertical height is thus provided about the front end portions of the boilers. If desired a supplemental air supply may be introduced into the combustion chamber 31. This plemental air supply is preferably introduced at the rear end of the combustion chamber. as through a transverse duct 32 which extends through the floor 29 of the flue 27 immediately in rear of its vertically offset portion 33, and this duct has a plu rality of forwardly directed openings 34 communicating with the combustion chamber. Preferably the duct 32 extends through ash-pit the side Walls 21. 22. of the boiler setting at its ends. and the openings thus provided are controlled b5' dauipers 35 36.

The tiro boilers lll, l1, are served from a common tire box generally designated by the numeral 153. This lire box is preferably low cated Wholly in front of the plane of the front end walls of the boilers. and it is most desirably equal in width to the full width of the boiler setting 12 but is of relatively small depth. As shown, the fire box 13 has masonry side Walls 3T, 3S, and a masonry roof 39. The hre box roof 39 is preferably flat and is located at a lower elevation than the boilers I0, 11. A grate L0 extending for the entire width of the fire box between the side walls 3T, 38, is preferably located at the same elevation as the floor 30 of the combustion chamber 31. The front eudwall 41 of tliere box 13 is provided with the usual fire doors 42, leading to that part of the chamber joe lire box which is above the grate.l and 'the usual draft doors 43 leading to the space 44 provided below the grate. Hfdesired additional doors 5 may be provided in the front `wall l1 at the level of the grate 40 for the introduction of slice bars to When the structure is to be in con necton with the manufacture Aof lumber, a

` of chutes 4:6, 47, will be preferably prointhe roof 39 of the rebox for the automatic delivery of oifal onto the grate '10.

,lllthiscasthechutes46,47,willbeso pladas "to delirer the oal into pyramdal piles YX symmetrically arranged upon the grate 40. The two boilers 10, '1.1, preerably Vhave a common anche box or breechiug 48 .of usual construction. This is overlihe rear end portion of the fire :box 13 in rear ofthe chutes 46, 4T, and

it communicates with a smoke'pipe or stack Qin the usual way. The rear end of the of the fire box 13 is preferably open for its entire Width and height as indicated at 51 and isl in direct communication with the combustion chamber 31.

In the operation of the furnace the relatively low flat masonry roof 39 of the Eire box 13 becomes highly heated vby continued to the flames, and as-it will preferably be formed of non-conducting materiah as by being covered with ashes ory sand, as at (Figs. 1 and E!) a high temperature will be maintained within the chamber `of the fire box. Large quantities of vapor will thus be evolved from the pil of fuel X, andthis vapor ill pas; freely into the combastion chamber 31 through the open rear end 51 of the tire box chamber. The combuston chamber 31 is of sucientcapacity to receive large quantitiesof vapor Without requiring the same to pag through it rapidly, whereby the combustible portions of this vapor may bc completely consumed beA stitulzing fore they enter the flue space 27. Furthermore the combustion of these vapors in the combustion chamber 31 assists in maintain ing a high temperature in the fire box by reason of the position of the chamber 31 adjacent the re box and b v reason of the open communication between the two. lt has been found that the otl'al from saw mills can be used for the generation of steam in furnaces of the kind here described, eilicienty and without the formation of any considerable quantity of smoke, thus indiciting that the combustion proceeds rapidly and that it is substantially complete.

While the duet 32 provides for the intro duction of a supplemental air supply to the combustion chamber 31 when required, it will usuallybe found that sullcient air for complete combustion will enter through the grate 4() whereby the duct 32 need not be used, as by closing the ends ofthe duct through the use of the dampers 35, 36.

By making the rear wall 33 of the combustion chamber 31 vertical there is no o portunity for ashes carried over by e flames to colleet'on its surface so that it attains a high temperature. By having this wall face the chamber of the fire box there is an interchange of heat, by radiation and reflection, between this wall and the chamber of the fire box. materi ally asaists in maintaining a high temperaturey both in the fire box and in the wall itself. The travel of the gases through the ne space 27 is so rapid, because of the restricted size of this passage as compared vv,with the size of the combustion 3 that the floor of the paage xs continuously swept clean7 thus enabling it to attain a high temperature and asiat in thetransmiion ofbeat to the under sdeof the boiler shell.

While the-rear wall 33 of the combustion chamber is shown as extending straight across the boiler settingfrom side to side, this is uotessential and no-stressis laid upon the shape of the wall in ths rpect I claim as my invention- A steam boiler for the use of saw dust and the like as fuel comprising, in combination, :,1.i`1reboxhavingagrateoriwhich:miguted heap of the fuel is maintained and oonaretortchamher,therearendof the fire box bei open for substantially its entire width and ightgmeans Vfor supplying air for combustion through the grate and fuel heap, a commodous .combustion chamber located immediately in rear of the lire box. and communicating directly with the chamber thereof through the said open rear end of the lire box, said combustion chamber being constructed to reinin the Vgases de livered to it from the chamber of the fire box Within the zone of combustion until their combustion is substantially complete and the rear Wall of the said combustion chamber being of refractory material and being located adjacent the fire box and having a surface which directl7 faces the chamber of the lire box through lts said o en rear end, whereby the combustion of t e ygases within the said combustion chamber, by direct reaction of heat upon 'the fuel heap and by radiation and reflection of heat from the said wall upon the heap, facilitates the drying and destructive distillation of the fuel, 10 and a heating Hue leading out of the said combustion chamber.

WILLIAM A. GILCHRIST.

Witlidesses Pm, W. M. MARTIN.

chamber being of refractory material and 'saiii wall upon the hea facilitates the dn belng located adjacent the fire box and havving and destructivel distillation of the fli'gl, 10

ing a surface which dlrectl7 faces the chamand a heating fiue leading out of the said ber of the fire box through Its said o en rear combustion chamber.

5 end, whereby the combustion of t @gases WILLIAM A. GILCHRIS'I.

within the 4,said combustion chamber, by di- Witnesses: rect reaction of heat upon 'the fuel heap and M. COOPER, by radlatlon and rei'lectionof heat from the W. M. MARTIN.

It is hereby certified that in Letters P .ant No. 1,166,670, granted January 4, 1916, luponI the application of William A. Gilchrist, of Memphis,iTennessee, for an improvement in iSteamfBoiler Furnaces, an error appears in the printed specili- ,cation `requiring correction as follows: Page 2, line `113, claim, after erthe'wcrd biler" Vinsert the word furfmce; and that the said Letters Patent should read.

with this correction therein that the saine may conform to the record of the case the Patent Oice. i

signed and ala this 3d day I october, A. D., i916.

[um] f F. W. II CLAY,

l Adinormnissioner of Patents. i

It is hereby oertied that in Letters P .ant No. 1,166,670, granted January 4,

1916, upon the application of William A. Gilchrist, of Memphis,iTennessee, for an improvement in "Steam-,Boiler Furnaces," an error appears in the printed specilication requiring correction as follows: Page 2, line 4113, claim, after the word boiler insert the wordfurmce; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oice.

signed and md his ad day f october, A. D., 1916.

[um] F. w. LL CLAY,

Adi'rmCom/m'isaioner of Poteau. 

